title: Influence of artificial aging in marginal adaptation of mixed class V cavities.
abstract: The aim of this study was to investigate whether the artificial aging by thermal cycling had influenced the marginal adaptation of class V restorations with/without chlorhexidine application in the bond process. Twelve intact human third molars were used. Class V cavity preparations were performed on the buccal surface and the teeth received 35% phosphoric acid-etching procedure (Ultradent Products Inc., South Jordan, Utah, USA). Subsequently, the samples were divided in two groups: Untreated acid-etched dentin and chlorhexidine application as an adjunct in the bond process. The adhesive Single Bond 2 (3M ESPE, St. Paul, MN, USA) was used after 2% chlorhexidine application, and the restorations were performed with Filtek™ Z350 XT (3M ESPE) composite resin. The specimens were submitted to artificial aging by thermal cycling with 3,000 cycles. Analyzes were performed on scanning electron microscopy using replicas of marginal adaptation in percentage of continuous margin before and after the artificial aging. The data were analyzed by paired test and the results showed statistically significant differences in the percentage of continuous margin with/without chlorhexidine treatment before and after thermal cycling. This study concluded that the artificial aging by thermal cycling influenced the marginal adaptation of mixed class V composite restorations.
authors.affiliation: Department of Restorative Dentistry, Araraquara School of Dentistry, University of São Paulo State, Araraquara, São Paulo, Brazil.
authors.forename: Mateus Rodrigues
authors.initials: MR
authors.lastname: Tonetto
authors.forename: Matheus Coelho
authors.initials: MC
authors.lastname: Bandéca
authors.forename: Hélida Gomes de Oliveira
authors.initials: HG
authors.lastname: Barud
authors.forename: Shelon Cristina Souza
authors.initials: SC
authors.lastname: Pinto
authors.forename: Darlon Martins
authors.initials: DM
authors.lastname: Lima
authors.forename: Alvaro Henrique
authors.initials: AH
authors.lastname: Borges
authors.forename: Edson Alves
authors.initials: EA
authors.lastname: de Campos
authors.forename: Marcelo Ferrarezi
authors.initials: MF
authors.lastname: de Andrade
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D002710:Chlorhexidine / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods; D003737:Dental Cavity Preparation / Q000145:classification*; D003738:Dental Cements / Q000737:chemistry; D003743:Dental Enamel / Q000648:ultrastructure; D018772:Dental Marginal Adaptation; D003764:Dental Materials / Q000737:chemistry*; D003804:Dentin / Q000648:ultrastructure; D006801:Humans; D006813:Humidity; D008422:Materials Testing / Q000379:methods; D008855:Microscopy, Electron, Scanning; D010756:Phosphoric Acids / Q000737:chemistry; D016628:Replica Techniques; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors
chemical_list: C554641:Adper single bond 2; D003188:Composite Resins; D003738:Dental Cements; D003764:Dental Materials; D010756:Phosphoric Acids; C533204:filtek Z350; C030242:phosphoric acid; D002710:Chlorhexidine